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The present study reports the synthesis, characterization, and antibacterial properties of silver trimolybdate (Ag2Mo3O10.2H2O) nanorods. The synthesis was performed using a conventional hydrothermal method. The sample was characterised by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, UV–Vis–NIR diffuse reflectance, thermogravimetric analysis (TGA), and differential scanning calorimeter (DSC). The direct antibacterial activity was evaluated using the microdilution method to determine the minimum inhibitory concentration (MIC). To assess the ability of Ag2Mo3O10.2H2O nanorods to modulate antibacterial resistance, the MIC of aminoglycosides was established in the presence of a subinhibitory concentration of this substance alone and associated with LED light exposure. The characterization of the sample indicated that the synthesis of silver trimolybdate generated nanometric crystals with rod-like morphology, without secondary phases. The treatment with Ag2Mo3O10.2H2O nanorods alone or combined with visible LED lights exhibited clinically relevant antibacterial activity against both Gram-negative and Gram-positive bacteria. This nanostructure presented a variable antibiotic-modulating action, which was not improved by visible LED light exposure. Nevertheless, LED lights showed promising antibiotic-enhancing activities in the absence of Ag2Mo3O10.2H2O nanorods. In conclusion, silver trimolybdate dihydrate nanorods have antibacterial properties that can be photocatalysed by visible-light exposure. While showing the potential use to combat antibacterial resistance, the simultaneous combination of silver trimolybdate, visible LED lights, and antibacterial drugs should be carefully analysed to avoid antagonist effects that could impair the effectiveness of antibiotic therapy. [ABSTRACT FROM AUTHOR]

The abuse of drugs and their indiscriminate sale are one of the main factors for bacterial resistance, which is a serious health problem. Essential oils are a source of bioactive compounds that may have antimicrobial properties. In this context, a-pinene stands out, a monoterpene that can be extracted from essential oils of plants and has medicinal action. Thus, the present work aims to evaluate the antimicrobial and modulating activity of a-pinene when associated with the Light Emitting Diodes (LED) apparatus against multiresistant bacterial strains. For this purpose, the gaseous contact technique and modulation with antibiotics and blue LED light were used to determine the antimicrobial activity. The minimum inhibitory concentration (MIC) of the a-pinene was = 1024 µg/mL. Possible synergism occurred between a-pinene associated with antibiotics and LED light of the class of Quinolones (Norfloxacin, Ciprofloxacin), Aminoglycosides (Gentamicin, Amikacin) and Beta Lactamic (Penicillin G and Oxacillin) that showed inhibitory potential against multidrug-resistant strains of Staphylococcus aureus and Escherichia coli. The results indicate that the a-pinene has a synergistic action when associated with conventional antibiotics, such as amikacin, which satisfactorily inhibited E. coli and oxacillin, which inhibited S. aureus. In this sense, a-pinene may be a compound with beneficial effects for the treatment of bacterial infections related to resistant strains. [ABSTRACT FROM AUTHOR]

The present study reports the synthesis, characterization, and antibacterial properties of silver trimolybdate (Ag 2 Mo 3 O 10 .2H 2 O) nanorods. The synthesis was performed using a conventional hydrothermal method. The sample was characterised by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, UV-Vis-NIR diffuse reflectance, thermogravimetric analysis (TGA), and differential scanning calorimeter (DSC). The direct antibacterial activity was evaluated using the microdilution method to determine the minimum inhibitory concentration (MIC). To assess the ability of Ag 2 Mo 3 O 10 .2H 2 O nanorods to modulate antibacterial resistance, the MIC of aminoglycosides was established in the presence of a subinhibitory concentration of this substance alone and associated with LED light exposure. The characterization of the sample indicated that the synthesis of silver trimolybdate generated nanometric crystals with rod-like morphology, without secondary phases. The treatment with Ag 2 Mo 3 O 10 .2H 2 O nanorods alone or combined with visible LED lights exhibited clinically relevant antibacterial activity against both Gram-negative and Gram-positive bacteria. This nanostructure presented a variable antibiotic-modulating action, which was not improved by visible LED light exposure. Nevertheless, LED lights showed promising antibiotic-enhancing activities in the absence of Ag 2 Mo 3 O 10 .2H 2 O nanorods. In conclusion, silver trimolybdate dihydrate nanorods have antibacterial properties that can be photocatalysed by visible-light exposure. While showing the potential use to combat antibacterial resistance, the simultaneous combination of silver trimolybdate, visible LED lights, and antibacterial drugs should be carefully analysed to avoid antagonist effects that could impair the effectiveness of antibiotic therapy., Competing Interests: The authors declare that there are no conflicts of interest., (Copyright © 2022 Maria Karollyna do Nascimento Silva Leandro et al.)